[Unit]
Description=iperf3 server
After=syslog.target network.target

[Service]
User=root
ExecStart=/usr/bin/iperf3 -s --logfile /var/log/iperf.log --pidfile /var/run/iperf3/iperf3.pid
Restart=always

[Install]
WantedBy=multi-user.target